The fruits in the pyramid are more nutritionally dense per calorie than nuts and cheese are.

Berries particularly are high in antioxidants and myriad vitanutrients, moreover water and fiber, and the proportionate quantity of fruits in a diet would be higher than nuts.

Nuts and cheese should be eaten in serious moderation because they are very high in calories, and it is very easy to abuse nuts (where a normal serving is only 1 oz weight) and packs about 150 - 200 calories.

That's not to say that nuts don't have their place, because they are very nutritious, but eaten in small quantities.